Math
Percentage Calculator
Calculate percentages instantly — find what percent of a number is, what percentage one number is of another, or the percentage change between two values.
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Frequently Asked Questions
How do I calculate X% of a number?
Multiply the number by X, then divide by 100. For example, 20% of 80 = 80 × 20 ÷ 100 = 16.
How do I find percentage change?
Percentage change = ((New - Old) / Old) × 100. Positive = increase, negative = decrease.